Heater hood



June 23, 1959 Filed April 5 1957- P. T. FORD HEATER HOOD I l 1 n PERRY CORBET T MAH NEY &

IN V EN TOR.

FORD

M ILLER TYS.

June 23, 1959 Filed April 3. 1957 2 Sheets-Sheet 2 INVENTOR.

T. FORD PERRY CORBETR MAHO Y am ILLEFL v TYS. BY KM United States Patent HEATER HOOD Perry T. Ford, Columbus, Ohio Application April 3, 1957, Serial No. 650,524

2 Claims. (Cl. 126-2712) My invention relates to a heater hood. It has to do, more particularly, with a hood which is adapted to be pulled over a pavement surface, such as an asphalt or bituminous road surface, in order to heat and soften such surface so that it can be subjected to a planing operation to provide a smoother surface or to a roughening operation to facilitate the binding thereto of a resurfacing layer of asphalt or bituminous material.

Heater hoods have been provided for the purposes indicated above in the prior art. However, these hoods are usually provided on a machine which carries the hood in association with a planing blade or other surface-working implement. In a machine of this type, the space is quite limited and, therefore, the heater hood must be relatively short. The result is that the hood not only does not heat a very large area of the surface but the heat does not penetrate sufficiently and, consequently, it is necessary to work the surface with an implement following almost directly behind the hood. Furthermore, the heating arrangements used in hoods of the prior art have not been completely efficient and effective in penetrating a sufficient depth into the surface.

It is the main object of my invention to provide a heater hood for heating pavements which can be of any desired length so that it can heat an adequate area of the pavement and the heat will penetrate sufiiciently into the pavement as the'hood passes thereover.

Another object of my invention is to provide a heater hood of the type indicated which has a heating arrangement which is more effective in obtaining penetration of a pavement surface to be heated.

Still another object of my invention is to provide a heater hood which is a self-supporting unit and need not be mounted on any other machine.

Various other objects will be apparent.

In the accompanying drawings, I have illustrated one example of my invention. However, it is understood that specific variations may be made without departing from the basic principles involved in my invention.

In these drawings:

Figure 1 is a plan view of a heater hood made in accordance with my invention.

Figure 2 is a side elevational View of the hood.

Figure 3 is a rear elevational View of the hood.

Figure 4 is a side elevational View of the hood in association with other units to form a complete machine.

Figure 5 is a rear end view of the machine shown in Figure 4.

Figure 6 is a detail showing one of the steam forming units in detail.

According to my invention, I provide a heater hood which is composed of any desired number of sections which are suitably secured together. I have shown the three sections 11, 12, and 13 in the drawings but it is to be understood that any desired number of sections may be provided. The section 11 is the front section whereas the section 13 is the rear section and these sections are always used. However, instead of using a single intersections.

mediate section 12, any number of these sections may be employed. Thus, a hood of any desired length may be provided. These sections may be suitably bolted together as indicated in the drawings, by means of bolts 14 which pass through abutting angle irons or flanges provided at adjacent ends of the sections.

The front section 11 has associated therewith a forwardly extending frame 15. Depending from this frame are supports for the guiding wheels 16 which may consist of a pair of closely spaced wheels 16 only one of which is shown in Figure 4, the supports being pivoted so that the wheels can be swung in a horizontal plane. A tongue 17 extending from the axle of the wheels 16 may be used for pulling and guiding the machine.

The rear section 13 of the hood is provided with a rearward extension 18 which is supported by the wheels 19 rotatably connected to the extension. This extension 18 carries a motor 20 which may be of the internal combustion type and which drives the blower 21. The extension may also support the oil tank 23 and the water tank 24.

The hood sections are so formed that they provide inwardly and upwardly tapering side walls 30, a similar tapering front wall 31 and a similar tapering front wall 32. With this arrangement there is also provided a central top wall 33 of substantial width which extends the greater portion of the length of the hood.

Heat is supplied for the hood by means of a plurality of longitudinally spaced oil burners 35. At least one of these oil burners is provided for each hood section. Oil is supplied to these burners by means of a manifold line 36 running at one side of the flat top wall 33 from the oil tank 23 to the various burners 35. The line 36 is composed of sections to permit insertion or removal of sections when the hood is to be made longer or shorter. Associated with each burner is a valve 37 for controlling the flow of oil thereto. Each burner is connected by a forwardly and inwardly extending branch duct 38 to the main duct or manifold 39. This manifold 39 extends from the forwardmost burner 35 to the blower 21 at the rear of the machine. The manifold is made of separable sections of a length similar to the lengths of the hood Thus, primary air for combustion is supplied to each burner.

Apertures 40 of suitable size and number are formed throughthe flat top wall 33 adjacent each burner 35. The size of these apertures is controllable by pivoted dampers 40a.

It will be noted that each of the hood sections is provided at each side thereof with a shoe 41 on which the hood is supported to slide along the surface. As shown in Figure 2, each of these shoes is provided with a plurality of longitudinally spaced apertures 42. Air will be drawn inwardly into the hood downwardly therethrough and out through the apertures 42 to prevent build-up of too much pressure within the hood. Bafile plates 43 are suspended from the hood outside of each shoe 41 and in spaced relationship thereto as best shown in Figure 3 to prevent excessive drafts through the openings 42 into the hood. However, these bafies 43 will not prevent the gentle flow of air through the apertures 42 into the hood. These baffles are suspended from the hood by means of the longitudinally spaced brackets 44. They are preferably connected to the brackets by pin and slot connections 45 which permit free vertical movement of the baflles 43 as the hood is pulled along the pavement surface. The wheels 16 and 19 are so supported relative to the shoes 41 that the shoes will just contact and slide along the pavement surface.

In order to obtain more effective penetration of the heat into the pavement, I have found that it is desirable to provide a moist steam atmosphere within the hood. To produce this steam, 1 provide the units 50 which are disposed within the hood. At least one of these units 50 is provided in each hood section but in the drawings 1 have illustrated two of these units for each hood section.

Each of these units 50 (Figure 6) comprises a metal pan 51 disposed within the hood adjacent the top wall 33 thereof. Each pan 51 is suspended from the top wall 33 and is lowered and raised relative thereto by means of a screw 52. Over each pan is a drip nozzle 53 and each nozzle is provided with a valve 54 adjustable from above and outside the hood to control the amount of drip. Each of the nozzles 53 is connected to a manifold water supply line 55 which leads rearwardly from the forwardmost nozzle to the water tank 2 2. This line is composed of sections to provide for lengthening or shortening the hood. Thus, water is dripped onto each of the pans 51. Because these pans are within the hood, when the burners 35 are operating the pans will become quite hot and, therefore, when the drops of water strike the pans they will be converted into steam. This steam will fill the entire hood and, therefore, the moist heat will more effectively penetrate into the pavement surface.

It will be noted from Figures 1 and 2 that the openings 40 in the top wall 33 will be spaced from the burners so that they will not interfere with the atomizing of the oil by the burners. Since they are formed in the top wall 33 they will prevent the build-up of vapor or stagnant air adjacent the top of the hood.

It will be apparent from the above description that I have provided a heater hood which is composed of sections so that it can be made of any desired length. Therefore, it can be made to heat a sufiicient area of pavement to obtain good penetration of the heat as it passes over the pavement. Furthermore, the steam developing means which I provide within the hood insures more effective penetration. Also, the arrangement of air apertures in the hood provides for etfective circulation of air and the heating medium without stagnation. The hood can be pulled along independently of any other machine or pavement-working implement and the implement need not follow directly behind the hood because of the effective penetration of the heating medium which will be retained within the pavement for some time.

According to the provisions of the patent statutes,

the principles of this invention have been explained and have been illustrated and described in what is now considered to represent the best embodiment. However, it is to be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.

Having thus described my invention, what I claim 1. Apparatus adapted to be moved over a pavement to cause heat to penetrate and heat the pavement comprising a hood, said hood having a top fiat Wall and outwardly and downwardly tapering side and end walls, means for heating the interior of the hood, said means comprising fluid fuel burner units supported on said flat wall at longitudinally spaced intervals, means for developing steam within the hood to obtain more effective penetration of the heat generated by said burner units within the hood into the pavement, said means comprising a steam-iorrning unit adjacent each of said burner units, each of said steam-forming units comprising a pan supported directly beneath said flat wall of the hood, means for supporting said pan from the fiat top wall, said supporting means being adjustable to raise or lower said pan relative to said wall, and means for dripping water onto said pan which will be heated by the heat from the burner units and will, therefore, generate steam, said water-dripping means including an adjustable flow valve.

2. Apparatus according to claim 1 including means for insuring circulation of the heated air within the hood, said means comprising apertures at the bottom of the hood and an adjustable aperture in the top of the hood adjacent each of the steam-forming units.

References Cited in the file of this patent UNITED STATES PATENTS 633,691 Garvey Sept. 26, 1899 877,515 McKeen Jan. 28, 1908 1,062,655 Macleod May 27, 1913 1,166,305 Allen Dec. 28, 1915 1,399,229 Servoss Dec. 6, 1921 1,523,975 Little Jan. 20, 1925 1,702,546 Owens Feb. 19, 1929 1,712,629 Moore May 14, 1929 2,093,840 Kulezak Sept. 21, 1937 2,273,254 Davis Feb. 17, 1942 

